This document provides an overview of water processing and safety. It discusses how groundwater is collected and purified as it passes through the earth. Most plastic water bottles are made from PET, which can leach chemicals like BPA when heated. The document recommends using plastic bottles with codes 1, 2, 3, or 5 and avoiding numbers 7 and above. While bottled water is widely marketed, tap water is also regulated by the EPA and FDA and sometimes provides a safer alternative to bottled water. The summary recommends various water purification methods and using BPA-free reusable containers.